Sierra acquires Anon to help AI agents navigate websites
Sierra is acquiring Anon, a company that builds infrastructure for enterprise AI agents to securely use websites, including signing in and filling out forms when no API is available. Anon’s team and technology will join Sierra as its agents take on longer-running tasks across multiple systems.
- Sierra is acquiring Anon and its team and technology.
- Anon helps agents navigate websites, sign in and fill out forms without APIs.
- Anon raised more than $13M and served hundreds of customers.
- Its agents completed hundreds of thousands of complex tasks in production.
- The technology will support Sierra agents working across multiple systems.
Anon built infrastructure for browser-based agents
Anon was created to help AI agents work through websites in ways similar to people. Its technology supports activities such as navigating pages, handling authentication and credentials, signing in, filling out forms and taking actions in interfaces designed for people rather than software.
The company said its platform included browser infrastructure, an agent harness and an SDK that developers could embed in their products. It focused on environments where much of the work takes place behind a login and where no API exists.
Anon said it raised more than $13M and shipped a product used by hundreds of customers, ranging from AI startups to publicly traded companies. Over the past year, it also built and deployed agents for large enterprise customers in banking, healthcare and enterprise software.
Reliability and security were central to Anon’s work
Anon said reliability became its central focus because browser use can involve sensitive information, multi-factor authentication and long-running tasks. Its agents were designed to run for hours on a single task and recover when something broke.
According to Anon, its systems completed hundreds of thousands of complex tasks in production. The company said this work shaped its understanding of what enterprises need from agents operating at scale, particularly when those agents must handle sensitive data and interact with services that were not built for automated software.
The company described its original goal as creating infrastructure for the wider wave of AI agents. It compared that ambition to building “Plaid for AI agents,” according to the announcement.
Sierra plans to extend agents across more systems
Anon said it saw a close fit with Sierra because the companies worked on related problems for many of the same businesses, with similar expectations around security and reliability. Sierra’s Horizon agents are pursuing longer-running goals such as originating a loan or getting prior authorization for a healthcare procedure.
Those goals can require work across several systems, including websites and services without APIs. Sierra said Anon’s technology will help its agents bridge that gap. When a task requires signing in to a website, navigating a portal or entering information through a browser, the agents will be able to carry more of the work through to completion.
The announcement also comes as Sierra reports rapid growth. Sierra said it reached more than $400M in ARR and added more than $150M in ARR in Q3 alone. It also said it is raising $950 million from new and existing investors at a valuation of over $15 billion. For users, the acquisition could expand the range of enterprise tasks Sierra agents can complete, but the announcement does not provide details about product availability or integration timing.
Sierra: Sierra acquires Anon
